<html lang="zh-CN">
<head>
    <style>
        .anticon {
            display: inline-block;
            color: inherit;
            font-style: normal;
            line-height: 0;
            text-align: center;
            text-transform: none;
            vertical-align: -0.125em;
            text-rendering: optimizeLegibility;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .anticon > * {
            line-height: 1;
        }

        .anticon svg {
            display: inline-block;
        }

        .anticon::before {
            display: none;
        }

        .anticon .anticon-icon {
            display: block;
        }

        .anticon[tabindex] {
            cursor: pointer;
        }

        .anticon-spin::before,
        .anticon-spin {
            display: inline-block;
            -webkit-animation: loadingCircle 1s infinite linear;
            animation: loadingCircle 1s infinite linear;
        }

        @-webkit-keyframes loadingCircle {
            100% {
                -webkit-transform: rotate(360deg);
                transform: rotate(360deg);
            }
        }

        @keyframes loadingCircle {
            100% {
                -webkit-transform: rotate(360deg);
                transform: rotate(360deg);
            }
        }
    </style>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="keywords" content="面试,笔试,刷题,试题,校招,社招,求职,秋招,IT,程序员,编程,代码,前端,后端,Java,Python,产品,运营">
    <meta name="description" content="专业面试刷题网站，助你成为面试达人！支持自由组卷、在线刷题、校招社招斩获大厂offer，求职必备！">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <title>面试鸭 - 助你成为面试达人</title>
    <link rel="icon" href="/favicon.ico" type="image/x-icon">
    <link href="/css4/monokai-sublime.min.css" rel="stylesheet">
    <script src="/js4/highlight.min.js"></script>
    <link rel="stylesheet" href="/css4/umi.153f7631.css">
    <script>
        window.routerBase = "/";
    </script>
    <script>
        //! umi version: 3.5.20
    </script>
    <style type="text/css">@font-face {
        font-family: 'bf-icons';
        src: 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format("truetype");
        font-weight: normal;
        font-style: normal;
    }

    .braft-finder [class^="braft-icon-"], .braft-finder [class*=" braft-icon-"] {
        /* use !important to prevent issues with browser extensions that change fonts */
        font-family: 'bf-icons' !important;
        font-style: normal;
        font-weight: normal;
        font-variant: normal;
        text-transform: none;
        /* Better Font Rendering =========== */
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    .braft-finder .braft-icon-code:before {
        content: "\E903";
    }

    .braft-finder .braft-icon-pause:before {
        content: "\E034";
    }

    .braft-finder .braft-icon-play_arrow:before {
        content: "\E037";
    }

    .braft-finder .braft-icon-bin:before {
        content: "\E9AC";
    }

    .braft-finder .braft-icon-replay:before {
        content: "\E042";
    }

    .braft-finder .braft-icon-close:before {
        content: "\E913";
    }

    .braft-finder .braft-icon-music:before {
        content: "\E90E";
    }

    .braft-finder .braft-icon-camera:before {
        content: "\E911";
    }

    .braft-finder .braft-icon-file-text:before {
        content: "\E926";
    }

    .braft-finder .braft-icon-film:before {
        content: "\E91C";
    }

    .braft-finder .braft-icon-paste:before {
        content: "\E92D";
    }

    .braft-finder .braft-icon-spinner:before {
        content: "\E980";
    }

    .braft-finder .braft-icon-media:before {
        content: "\E90F";
    }

    .braft-finder .braft-icon-add:before {
        content: "\E918";
    }

    .braft-finder .braft-icon-done:before {
        content: "\E912";
    }

    .braft-finder .braft-icon-drop-down:before {
        content: "\E906";
    }

    .braft-finder .braft-icon-drop-up:before {
        content: "\E909";
    }

    .braft-finder .braft-icon-help:before {
        content: "\E902";
    }

    .braft-finder .braft-icon-info:before {
        content: "\E901";
    }

    .braft-finder .braft-icon-menu:before {
        content: "\E908";
    }

    .pull-left {
        float: left;
    }

    .pull-right {
        float: right;
    }

    .braft-finder .bf-uploader {
        position: relative;
        height: 370px;
        margin: 0;
    }

    .braft-finder .bf-uploader.draging .bf-list-wrap,
    .braft-finder .bf-uploader.draging .bf-add-external {
        pointer-events: none;
    }

    .braft-finder .bf-uploader input::-webkit-input-placeholder {
        color: #ccc;
    }

    .braft-finder .bf-uploader input::-moz-placeholder {
        color: #ccc;
    }

    .braft-finder .bf-uploader input::-ms-input-placeholder {
        color: #ccc;
    }

    .braft-finder .bf-list-wrap {
        position: relative;
        height: 370px;
    }

    .braft-finder .bf-list-tools {
        z-index: 1;
        position: absolute;
        top: 0;
        right: 0;
        left: 0;
        height: 20px;
        padding: 0 15px;
        background-color: #fff;
    }

    .braft-finder .bf-list-tools span {
        height: 26px;
        font-size: 12px;
        line-height: 20px;
        cursor: pointer;
        user-select: none;
    }

    .braft-finder .bf-list-tools span[disabled] {
        opacity: .3;
        pointer-events: none;
    }

    .braft-finder .bf-list-tools .bf-select-all,
    .braft-finder .bf-list-tools .bf-deselect-all {
        float: left;
        margin-right: 5px;
        color: #bbb;
    }

    .braft-finder .bf-list-tools .bf-select-all:hover,
    .braft-finder .bf-list-tools .bf-deselect-all:hover {
        color: #3498db;
    }

    .braft-finder .bf-list-tools .bf-remove-selected {
        float: right;
        color: #e74c3c;
    }

    .braft-finder .bf-list-tools .bf-remove-selected:hover {
        color: #c92e1e;
    }

    .braft-finder .bf-list {
        position: absolute;
        z-index: 1;
        top: 30px;
        right: 0;
        left: 0;
        bottom: 0;
        margin: 0;
        padding: 0 10px;
        list-style: none;
        overflow: auto;
    }

    .braft-finder .bf-list::-webkit-scrollbar {
        width: 5px;
        height: 5px;
        background-color: #fff;
    }

    .braft-finder .bf-list::-webkit-scrollbar-track {
        background-color: #fff;
    }

    .braft-finder .bf-list::-webkit-scrollbar-thumb {
        background-color: rgba(0, 0, 0, 0.1);
    }

    .braft-finder .bf-item,
    .braft-finder .bf-add-item {
        position: relative;
        display: block;
        float: left;
        width: 113px;
        height: 113px;
        margin: 5px;
        overflow: hidden;
        border-radius: 3px;
    }

    .braft-finder .bf-item.uploading {
        pointer-events: none;
    }

    .braft-finder .bf-item.error::before {
        display: block;
        content: "\E901";
    }

    .braft-finder .bf-item.error::after {
        position: absolute;
        z-index: 1;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background-color: rgba(231, 76, 60, 0.8);
        content: '';
    }

    .braft-finder .bf-item.error:hover::after {
        background-color: rgba(231, 76, 60, 0.9);
    }

    .braft-finder .bf-item.error .bf-item-uploading {
        display: none;
    }

    .braft-finder .bf-add-item {
        background-color: #ecedef;
        color: #999;
    }

    .braft-finder .bf-add-item:hover {
        background-color: #e1e2e3;
    }

    .braft-finder .bf-add-item i {
        display: block;
        width: 113px;
        height: 113px;
        font-size: 48px;
        line-height: 113px;
        text-align: center;
    }

    .braft-finder .bf-add-item input {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        opacity: 0;
        cursor: pointer;
    }

    .braft-finder .bf-item::before {
        display: none;
        position: absolute;
        z-index: 2;
        top: 0;
        left: 0;
        width: 113px;
        height: 113px;
        color: #fff;
        font-size: 48px;
        font-family: 'bf-icons';
        line-height: 113px;
        text-align: center;
    }

    .braft-finder .bf-item::after {
        position: absolute;
        z-index: 1;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background-color: rgba(52, 152, 219, 0);
        content: '';
    }

    .braft-finder .bf-item:hover::after {
        background-color: rgba(52, 152, 219, 0.3);
    }

    .braft-finder .bf-item:hover .bf-item-remove {
        display: block;
    }

    .braft-finder .bf-item.active::before {
        display: block;
        content: "\E912";
    }

    .braft-finder .bf-item.active::after {
        background-color: rgba(52, 152, 219, 0.6);
    }

    .braft-finder .bf-item.active:hover::after {
        background-color: rgba(52, 152, 219, 0.8);
    }

    .braft-finder .bf-item.active:hover .bf-item-remove {
        display: none;
    }

    .braft-finder .bf-item-uploading {
        box-sizing: border-box;
        position: absolute;
        z-index: 3;
        top: 52px;
        left: 10px;
        width: 93px;
        height: 10px;
        overflow: hidden;
        background-color: rgba(255, 255, 255, 0.3);
        border-radius: 5px;
        box-shadow: 0 0 0 100px rgba(0, 0, 0, 0.5);
    }

    .braft-finder .bf-item-uploading-bar {
        height: 10px;
        background-color: #3498db;
        border-radius: 0;
    }

    .braft-finder .bf-item-remove {
        display: none;
        position: absolute;
        z-index: 2;
        top: 0;
        right: 0;
        width: 28px;
        height: 28px;
        color: #fff;
        font-size: 18px;
        line-height: 28px;
        text-align: center;
        cursor: pointer;
    }

    .braft-finder .bf-item-remove:hover {
        color: #e74c3c;
    }

    .braft-finder .bf-item-title {
        display: none;
        box-sizing: border-box;
        position: absolute;
        z-index: 2;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 40px;
        padding: 0 5px;
        overflow: hidden;
        background-image: linear-gradient(rgba(0, 0, 0, 0), black);
        color: #fff;
        font-size: 12px;
        line-height: 55px;
        text-align: center;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .braft-finder .bf-image {
        width: 100%;
        height: 100%;
        background-color: #eee;
        user-select: none;
    }

    .braft-finder .bf-image img {
        display: block;
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .braft-finder .bf-video {
        background-color: #8e44ad;
    }

    .braft-finder .bf-audio {
        background-color: #f39c12;
    }

    .braft-finder .bf-embed {
        background-color: #f1c40f;
    }

    .braft-finder .bf-icon {
        display: block;
        width: 113px;
        height: 113px;
        overflow: hidden;
        color: #fff;
        text-align: center;
        text-decoration: none;
    }

    .braft-finder .bf-icon i, .braft-finder .bf-icon span {
        display: block;
    }

    .braft-finder .bf-icon i {
        margin-top: 35px;
        font-size: 24px;
    }

    .braft-finder .bf-icon span {
        width: 103px;
        margin: 10px auto;
        overflow: hidden;
        font-size: 12px;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .braft-finder .bf-drag-uploader {
        box-sizing: border-box;
        position: absolute;
        z-index: 2;
        top: 0;
        right: 15px;
        left: 15px;
        height: 100%;
        background-color: #fff;
        border: dashed 1px #bbb;
        text-align: center;
        opacity: 0;
        pointer-events: none;
    }

    .braft-finder .bf-drag-uploader:hover, .braft-finder .bf-drag-uploader.draging {
        background-color: #f1f2f3;
    }

    .braft-finder .bf-drag-uploader.active {
        opacity: 1;
        pointer-events: auto;
    }

    .braft-finder .bf-uploader-buttons {
        height: 370px;
        margin: auto;
        text-align: center;
    }

    .braft-finder .bf-drag-tip {
        display: inline-block;
        margin-top: 150px;
        color: #ccc;
        text-align: center;
        font-size: 28px;
        font-weight: normal;
        line-height: 40px;
    }

    .braft-finder .bf-drag-tip input {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 100%;
        opacity: 0;
        color: #fff;
        text-indent: -100px;
        cursor: pointer;
    }

    .braft-finder .bf-manager-footer {
        height: 36px;
        margin: 10px 0;
        padding: 0 15px;
    }

    .braft-finder .bf-manager-footer .button {
        float: right;
        height: 36px;
        margin-left: 5px;
        padding: 0 35px;
        font-size: 12px;
        font-weight: 700;
        border: none;
        border-radius: 3px;
        cursor: pointer;
    }

    .braft-finder .bf-manager-footer .button-insert {
        color: #fff;
        background-color: #3498db;
    }

    .braft-finder .bf-manager-footer .button-insert:hover {
        background-color: #2084c7;
    }

    .braft-finder .bf-manager-footer .button-insert[disabled] {
        opacity: .3;
        pointer-events: none;
        filter: grayscale(0.4);
    }

    .braft-finder .bf-manager-footer .button-cancel {
        color: #999;
        background-color: #e8e8e9;
    }

    .braft-finder .bf-manager-footer .button-cancel:hover {
        background-color: #d8d8d9;
    }

    .braft-finder .bf-toggle-external-form {
        color: #666;
        font-size: 12px;
        line-height: 36px;
    }

    .braft-finder .bf-toggle-external-form span {
        color: #bbb;
        line-height: 16px;
        cursor: pointer;
        user-select: none;
    }

    .braft-finder .bf-toggle-external-form span:hover {
        color: #3498db;
    }

    .braft-finder .bf-toggle-external-form span i {
        position: relative;
        top: 2px;
        font-size: 16px;
    }

    .braft-finder .bf-add-external {
        position: absolute;
        z-index: 3;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background-color: #fff;
    }

    .braft-finder .bf-add-external input {
        border: solid 1px rgba(0, 0, 0, 0.3);
        border: solid 0.5px rgba(0, 0, 0, 0.3);
        box-shadow: none;
    }

    .braft-finder .bf-add-external input:focus {
        border-color: #3498db;
        box-shadow: none;
    }

    .braft-finder .bf-external-form {
        width: 500px;
        max-width: 90%;
        margin: 91px auto 0 auto;
    }

    .braft-finder .bf-external-input {
        position: relative;
        width: 100%;
        height: 40px;
        margin-bottom: 10px;
    }

    .braft-finder .bf-external-input div {
        position: absolute;
        top: 0;
        right: 85px;
        left: 0;
        height: 40px;
    }

    .braft-finder .bf-external-input input,
    .braft-finder .bf-external-input textarea {
        display: block;
        box-sizing: border-box;
        width: 100%;
        height: 40px;
        padding: 0 10px;
        border: none;
        border-radius: 3px;
        outline: none;
        box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.3);
        color: #999;
        font-size: 18px;
    }

    .braft-finder .bf-external-input input:focus,
    .braft-finder .bf-external-input textarea:focus {
        box-shadow: inset 0 0 0 1px #3498db;
    }

    .braft-finder .bf-external-input textarea {
        height: 100px;
        font-size: 14px;
    }

    .braft-finder .bf-external-input button {
        position: absolute;
        top: 0;
        right: 0;
        width: 80px;
        height: 40px;
        background-color: #3498db;
        border: none;
        border-radius: 3px;
        color: #fff;
        font-size: 14px;
        font-weight: bold;
        cursor: pointer;
    }

    .braft-finder .bf-external-input button:disabled {
        opacity: .3;
        pointer-events: none;
        filter: grayscale(0.4);
    }

    .braft-finder .bf-external-input button:hover {
        background-color: #2084c7;
    }

    .braft-finder .bf-switch-external-type {
        overflow: hidden;
        text-align: center;
    }

    .braft-finder .bf-switch-external-type button {
        width: auto;
        height: 30px;
        margin: 10px 5px;
        padding: 0 10px;
        background-color: #e8e9ea;
        border: none;
        border-radius: 3px;
        color: #999;
        font-size: 12px;
        cursor: pointer;
    }

    .braft-finder .bf-switch-external-type button:hover {
        background-color: #d8d9da;
    }

    .braft-finder .bf-switch-external-type button:only-child {
        display: none;
    }

    .braft-finder .bf-switch-external-type[data-type="IMAGE"] [data-type="IMAGE"],
    .braft-finder .bf-switch-external-type[data-type="VIDEO"] [data-type="VIDEO"],
    .braft-finder .bf-switch-external-type[data-type="AUDIO"] [data-type="AUDIO"],
    .braft-finder .bf-switch-external-type[data-type="EMBED"] [data-type="EMBED"],
    .braft-finder .bf-switch-external-type[data-type="FILE"] [data-type="FILE"] {
        background-color: #3498db;
        color: #fff;
    }

    .braft-finder .bf-external-tip {
        display: block;
        margin-top: 15px;
        color: #ccc;
        font-size: 12px;
        text-align: center;
    }
    </style>
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                                                            【JAVA基础-集合】Java中的HashMap的底层原理实现、工作原理？</h5></a>
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                                                                <div class="ant-space-item"><span>2022-01-04</span>
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                                                            手动实现'防抖'和'节流'</h5></a>
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                                                            什么是死锁(deadlock)？</h5></a>
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                                                                <div class="ant-space-item"><span>2021-12-27</span>
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                                                            Redis的缓存击穿及解决方案</h5></a>
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                                                                <div class="ant-space-item"><span>2022-01-05</span>
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